package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        byte[] bytes = DigestUtils.md5Digest(password.getBytes());
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
       password = DigestUtils.md5DigestAsHex(password.getBytes());//转byte数组进行加密处理

        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /*
     * 新增员工的方法
     * */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        System.out.println("当前线程的id  service层" + Thread.currentThread().getId());
        Employee employee = new Employee();//employeedto是前端数据看的employee是给后端看的
        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);//把前面的属性值传给后面（属性一样的情况下）

        //设置账号状态去，默认正常为1，0为锁定
        employee.setStatus(StatusConstant.ENABLE);//StatusConstant设置常量类不用改业务代码

        //设置密码，默认123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));//PasswordConstant.DEFAULT_PASSWORD设置常量类不用改业务代码

        //设置记录当前时间、创建和 修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
//以上以通过在切面编程aspect里设置公共处理了
        //设置当前记录人信息
        //TODO 后期改为当前登录用户id
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());//线程id拿出来放入，谁操作的（admin操作所以id为1）
        employeeMapper.insert(employee);
    }
    /**
     * 分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    //要返回的数据类型是PageResult，但是mapper接口返回的是分页插件里面的Page类型
    //需要加工一下用page.getTotal()获得记录数
    //page.getResult()获得分页结果
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // select * from employee limit 0,10
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        //传递每页的页码和记录数计算limit分页动态拼接
        //底层原理是localThera的线程启动前就已经拿出来了page和pagesize

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);//后续定义

        long total = page.getTotal();
        List<Employee> records = page.getResult();

        return new PageResult(total, records);//返回PageResult类型
    }

    @Override
    /**
     * 启用禁用员工账号
     *
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        //方法一
//        Employee employee = new Employee();
//        employee.setStatus(status);
//        employee.setId(id);
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();//基于@Build注解的

        employeeMapper.update(employee);
    }
    /**
     * 根据id查询员工
     *
     * @param id
     * @return
     */
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("****");
        return employee;
    }
    /**
     * 编辑员工信息
     *
     * @param employeeDTO
     */
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();//需要返回employee数据，传过来的是EmployeeDTO数据
        BeanUtils.copyProperties(employeeDTO, employee);//属性复制

//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());//通过底层threadlocal来获得id
        //以上以通过在切面编程aspect里设置公共处理了
        //拦截器已经在每次请求中获得了id
        employeeMapper.update(employee);
    }
}
